This garden polytunnel greenhouse from Outsunny comes with an integrated tunnel composed of durable PE cloth over a high-quality steel pipe frame. Thanks to solar energy, polytunnels with the door can maintain a consistent temperature ideal for plant growth. Heavy duty greenhouse is an ideal way to extend your growing season while easily managing your plants in the garden polytunnel and protecting them from cold. One large opening adjustable roll-up window on each side of the tunnel greenhouse for cross ventilation on hot days and drain away water and reduce pressure to the greenhouse outdoor frame. This large greenhouse is constructed with a heavy-duty galvanised steel frame in a stable build, resistant to rust, corrosion, chipping and peeling. Two extra supporting rods add to the stability of this polytunnel.